104 lines
2.8 KiB
TypeScript
104 lines
2.8 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// This module is browser compatible.
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import { assertArg } from "./../_common/dirname.ts";
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import { CHAR_COLON } from "./../_common/constants.ts";
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import { stripTrailingSeparators } from "./../_common/strip_trailing_separators.ts";
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import {
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isPathSeparator,
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isPosixPathSeparator,
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isWindowsDeviceRoot,
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} from "./_util.ts";
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/**
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* Return the directory path of a `path`.
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* @param path - path to extract the directory from.
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*/
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export function dirname(path: string): string {
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assertArg(path);
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const len = path.length;
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let rootEnd = -1;
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let end = -1;
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let matchedSlash = true;
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let offset = 0;
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const code = path.charCodeAt(0);
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// Try to match a root
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if (len > 1) {
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if (isPathSeparator(code)) {
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// Possible UNC root
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rootEnd = offset = 1;
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if (isPathSeparator(path.charCodeAt(1))) {
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// Matched double path separator at beginning
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let j = 2;
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let last = j;
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// Match 1 or more non-path separators
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for (; j < len; ++j) {
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if (isPathSeparator(path.charCodeAt(j))) break;
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}
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if (j < len && j !== last) {
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// Matched!
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last = j;
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// Match 1 or more path separators
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for (; j < len; ++j) {
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if (!isPathSeparator(path.charCodeAt(j))) break;
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}
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if (j < len && j !== last) {
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// Matched!
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last = j;
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// Match 1 or more non-path separators
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for (; j < len; ++j) {
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if (isPathSeparator(path.charCodeAt(j))) break;
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}
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if (j === len) {
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// We matched a UNC root only
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return path;
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}
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if (j !== last) {
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// We matched a UNC root with leftovers
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// Offset by 1 to include the separator after the UNC root to
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// treat it as a "normal root" on top of a (UNC) root
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rootEnd = offset = j + 1;
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}
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}
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}
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}
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} else if (isWindowsDeviceRoot(code)) {
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// Possible device root
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if (path.charCodeAt(1) === CHAR_COLON) {
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rootEnd = offset = 2;
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if (len > 2) {
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if (isPathSeparator(path.charCodeAt(2))) rootEnd = offset = 3;
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}
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}
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}
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} else if (isPathSeparator(code)) {
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// `path` contains just a path separator, exit early to avoid
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// unnecessary work
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return path;
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}
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for (let i = len - 1; i >= offset; --i) {
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if (isPathSeparator(path.charCodeAt(i))) {
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if (!matchedSlash) {
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end = i;
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break;
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}
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} else {
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// We saw the first non-path separator
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matchedSlash = false;
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}
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}
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if (end === -1) {
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if (rootEnd === -1) return ".";
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else end = rootEnd;
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}
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return stripTrailingSeparators(path.slice(0, end), isPosixPathSeparator);
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}
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